Liquid strainer and pressure regulating unit



April 7, 1936.

T. w. MURPHY 9 LIQUID STRAINER AND PRESSURE REGULATING UNIT Filed Oct. 17, 1954 4 Sheets-Sheet l 4&

1N VENTOR. Thomas W. Murph 1 April 7, 1936. T. w. MURPHY LIQUID STRAINER AND PRESSURE REGULATING UNIT Filed Oct. 17, 1934 4 Sheets-Sheet 2 mmvmk. Thoma; WM rphy,

ATTOR 11.

A ril 7, 1936.

T. w. MURPHY 2,036,489

LIQUID STRAINER AND PRESSURE REGULATING UNIT Filed Oct. 17, 1934 4 Sheets-Sheet 3 l l E- 5 71 IN VENTUK. Thomas W Murph ATTORNEY Fatented Apr. 7, E936 LIQUID STBAINEB. AND PRESSURE BEGULATING UNIT Thomas w. Murphy, Bala-Cynwyd, Pa... assignor to Monarch Manufacturing Works, Inc., Philadelphia, Pa., a corporation of Delaware Application October 17, 1934, Serial No. 748,642

4 Claims. (Cl. 103-42) This invention reates to straining'and pressure regulating devices. and more particularly, to units for interchangeable association with pressure means to enable liquid to be supplied at de- 5 sired points under predetermined pressures.

The present invention has to do primarily with oil burning devices and will be explained in connection therewith, although limitations are not to be imposed thereby.

l In the usual oil burning system, on from a supply tank is passed through a strainer on the vacuum side of a pump and then from the pressure sideof such pump through a regulating valve which supplies'oil at predeterminedand 15 maintained pressure to the atomizer or burner nozzle. These parts are usually separate units.

and are connected into the supply line in the order named, although the entire combination comprising pump, strainer and regulating valve 20 has been, in at least one design, housed in a singlecaslng. has several objections, chief among them being that it is necessary to ,make

different castings for every change in pump-ca- I pacity, etc., and in caseof mutilation orbreak- 25 age of any-oi the parts of the casing, an entire new casing must be provided. Moreover, in case it is necessary to make certain repairs to the pump, the entirev unit must be de-mounted:

The object of the present invention is to pro- 30 vide a combination of elements to obtain a working unit in which these objections are overcome.-

.Another object is to provide a unit which can be quickly and conveniently installed and in like manner disconnected for repair or replacement 35 of any of the working parts.

Still another object is to provide a unit in which either a piston or diaphragm may be interchangeably used in a regulating. valve without dismantling of the unit. D

40 Still another object is to provide a mechanism adapted, without change, for use with pumps of diflerent types and capacities.

According to the invention, the pumping and regulating unit comprises a strainer and a regulating valveassociated for attachment to a pressure pump, and'so arranged that liquid is'drawn into the suction side of the pump through the strainer, and passed from the pressure side 01" .55 invention and the views therein are as follows:

Fig. 1' is a side elevation showing a unit assembled with a pump.

Fig. 2 is a plan'view of same.

Fig. 3 is a vertical sectional view oi. the line 3-4 of Fig. 2.

Fig. 4 is a like fragmentary view showing a different type of regulating valve. I r

Fig. 5 is a like fragmentary view showing still another type of regulating valve.

Fig. 6 is an enlarged detail section taken on the line 6-6 of Fig. 3.

Figs. '7, 8 and 9 show fragmentary views of a unit with other designs of regulating valves.

Fig. 10 is a plan view of another design of unit attached to a pump.

Fig. 11 is a front view of same.

Fig. 12 is a side view thereof. Fig. 13 is a vertical sectional view on the line i3-l3- of Fig. 10.

The unit shown in Figs. 1 to 5 inclusive broadly consists of a body 8, including'a strainer A, and a regulating valve B, connected by a bridge C. which is adapted for mounting with a pump D.

The pump D may be of any desired type having a vacuum inlet and pressure outlet.

The-unit shown in these figures straddles the pump, and the bridge C rests thereon. Suitable locating pins 9, in the bottom of the bridge flt into complimentary holes in the pump and prevent a side-wise movement of the unit, while a 39 bolt ll, 'extending through the bridge, secures the unit to the pump, arranged to conform wit the two-in-one unit passageways- The strainer has an interior chamber 12, and an inlet l3, threaded for connection with a pipe leading to a source or liquid supply. This chamber is provided with a screen basket [4, through which the liquid mustpass before being drawn into the pump. This basket is fastened in place between the body and the strainer cover it, and 40 suitable gaskets I! are provided to prevent any leakage around the cover.

The cover has a passageway l8 communicating with the"passageway I! in the bridge, and the latter passageway communicates with the vacuum side of a. pump D.. The passageways re ceive strained liquid only. The strainer has an opening 20 in the bottom thereof, normally closed by a screw plug 2! for cleaning the sediment from thechamber I2 No details of pump construction have been shown, as no particular type or pump is included as a part of the present invention, but any pump having the required capacity, etc., may beused. 7

The pump has passages I20 and |2| as shown in Fig. 1, so that it may be reversed, i. e., turned upside down, in which case the plugs I22 are inserted in the open ends of the passages.

The liquid from the pump D is forced under pressure through the goose-neck passageway 2|. and enters the pressure chamber 22 of the valve. Fig. 3 shows a bellows diaphragm type of valve wherein a double-ended needle valve stem 23 controls both the burner port 24, and the excess by-pass port 26. This valve is so constructed and regulated by the spring 21 that when the pressure of liquid in the pressure chamber 22 reaches a predetermined figure (let us assume, 60 pounds) the tension of said spring will be overcome and the diaphragm 28 compressed. This permits the spring 29 to move the valve stem 23 upward so that the needle 3| will be withdrawn from the seat 32 and liquid will flow from the pressure chamber 22 through the openings 33 and then from the outlet 34. In oil burning systems this outlet leads directly to the atomizer or spray nozzle, commonly called the burner.

As pressure on the liquid in the pressure chamber 22 continues to rise, the diaphragm will be further collapsed or compressed, and since the valve stem 23 has a limiting collar 35 which strikes against the shoulder 36, the needle 21 can only follow this movement for a predetermined distance. Consequently, when this predetermined pressure is reached (let us assume, 100 pounds), the valve seat 38 in the bottom of the diaphragm clears the valve 31 and excess liquid flows through the passageway 26 and from the by-pass outlet 4| back to the source of supply.

Screw 42 regulates the tension on the spring 21, which. can be adjusted to pass oil to the burner at any desired pressure and to by-pass the excess to the source of supply. v

The diaphragm .has an upper annular flange 43 resting on a shoulder 44, and this diaphragm is locked in place by a heavy spring 4e, fitting between the diaphragm flange 43 and, a valve cover 41. The head of the screw 42 is enclosed in a cap 48 to prevent accidental maladjustment and to prevent oil from escaping around the screw. This particular type of valve is illustrated and described in my co-pending applica-.

.tion Serial No. 574,308, filed November 11, 1931.

If preferred, a. permanent loop for the excess by-passed oil may be provided as shown in Fig. 6. A passageway 49 leads directly from the passageway 9 to an outlet 49' on the by-pass side ofthediaphragm 28. A ball 50 may be disposed in a seat 50' when'this permanent bypass is not desired. Itwill, of course, be readily seen that with the use of the loop the by-passed liquid, which has been filtered, will be passed to the suction side of the pump and passed to the pressure chamber of the valve.

Fig. 4 illustrates another type of valve in the same casing as shown in Fig. 3. This is a piston type valve and is shown on a slightly enlarged scale.

A sleeve 5| has an annular flange 52 which rests on a gasket 53 on the shoulder 4% and said sleeve-is in like manner secured in position by the spring 46.

In place of thediaphragm 28 this t pe of valve is provided with a piston 54 which operates in said sleeve,v and the movement of this piston is controlled exactly the same as the diaphragm,

to wit: by liquid pressure operating against the tension of the spring 21, which is regulated by the screw 42. This piston also has a seat 55 for the neeifie valve 31, and a passageway 51 for allowing the excess liquid to communicate with the bypass outlet 4|. With this type of valve, air will be entrapped and a cushion formed in the annular chamber 58, surrounding the said sleeve. Furthermore, while piston-valves have always heretofore been recommended to be installed With burner port down, this type of valve may be installed in any horizontal 'or vertical position because there is little danger of locking the piston by dirt or sediment on account of the bore for said piston being spaced from the inner wall of the casing This type of valve is illustrated and described in my co-pending application Serial No. 720,159, filed April 12, 1934.

Fig. 5 presents a different valve, although sleeve 5| is held in place by spring-46, and a piston is employed. The piston 55, however, carries a valve stem 59, which passes through a centrai opening 60 in said piston and is peened over at SE in order to provide for some resiliency of action while still maintaining seepage proof connection. The valve stem extends down through a sleeve portion 62 formed integral with the seat member 63 and aneedle valve 54 on the bottom thereof normally rests in a valve seat 66. The sleeve portion is protdded with the usual openings '61 while the valve stem is provided with a. tapered annular recess 68 having holes 59 extending across the vertex of said recess and communicating with a central passageway 10 which opens above the piston 55. This valve employs the regulating spring 21 and screw 2 as described in connection with Fig. 3.

When liquid under pressure is admitted to the pressure chamber 22, the piston 55 will move upward at the time a predetermined pressure is attained, and liquid will flow through the open- .ings 81 and the burner outlet. As the pressure continues to increase the piston continue to rise by overcoming the tension or the spring 21, and this will carry the valve stem 59 to a point where the top of the tapered annular recess is above the top of the sleeve portion 52, so that liquid will pass into the said recess, through the holes 69 and through the central passageway to the upper side of. the piston 55, and thence through the by-pass outlet 4| v Ofcourse the permanent loop shown in Fig. 6

may be utilized with this valve and also with the types shown in Figs. 7 to 9 inclusive.

the top 01' the said piston is a spiral spring 15.-

A passage It leading from the pressure side of the pump communicates with the pressure chamber 11 and also with the auxiliary chamber ll above the shoulder I4, while a passage I9 leads from said chamber ll to the space above thepiston I e An upper piston an has a depending needle I I,

normally closing the passage I5, jwhile a central hole 82 extends from the apex of the. needle through said piston and communicates with the chamber as from which the by-pass outlet 4| leads. The usual regulating spring 21 and screw 42 are employed in this valve.

When liquid under pressure is admitted to. the

pressure chamber H from the passageway 18, pressure is exerted against the bottom of the said pressure to a predetermined figure, the ten sion of the spring 55 is overcome and said piston moves upward. op ning the. burner port It. At the same time, pressure is being built up in the auxiliary chamber I9, but 'the tension of the spring 2! has been so 'set that it will not be overcome until the maximum operating pressure is attained. At such time, the upper piston 89 will rise, withdrawing the needle from the opening 19, and thus the liquid may pass through the hole 82 to the chamber 83 and from the excess bypass port M- Since the chamber is always at or near atmospheric pressure no pressure can be built up on the upper side of the lower piston l l. i

The valve shown in Fig. 8 employs a piston 84 and-a bellows diaphragm 85. The valve body has a partition 99 which has passages 81 leading from the pressure chamber 'lll'to the chamber 89. This piston also has 9. depending needle 89 normally resting in the valve seat 99 in the seat member 95 for closing the burner port 3d. The spiral spring "I5 rests between the top of the piston and the bottom oi the partition, while the partition is provided with a central opening 92 in which a needle 93 attached /to the bottom of the diaphragm normally rests. Theneedle has a passage 99 extending through it and communicating with the, chamber 98. The usual regulating spring 2i and screw. 42 control the action of the diaphragm.

' When pressure builds up under the piston 84 it overcomes the spring I5 and opens the burner port. At the same time, pressure has been built up on the diaphragm 85 but since the tension 0! thespring 21 has been so set, it requires a max-- imum operatingpressure to raise the needle 99 from the opening 92 to permit liquid to by-pass through the passage 94 into chamber 99 and from by-pass outlet 4!. v

The valve illustrated in Fig. 9 employs a lower piston 95 having a depending needle 96, normally closing a passageway 91 leading to the burner port 35. This piston has a spiral spring 98 in the pressure chamber TI, which is normally pressed between the bottom of said piston and the seat member 99 as later explained. Extending through the piston are holes I99, which communicate with a space I9 I between the top of.

said piston and the bottom of an upper piston 592. This latter piston has a depending valve member not, normally fitting into a seat m m the top of the lower piston 95, while a passage 695 extends upward through the valve member I99 and piston I92 to communicate with the chamber 89 and by-pas opening 4i. This valve also employs the regulating spring 27 and screw 62.

As the liquid under pressure enters the pressure chamber ill, a portion thereof passes up through the holes H99 into the space IN and builds upon equalizing pressure on each side of the lower pis ton .99. When this pressure exerted against the bottom of the upper piston is suflicient to overcome the tension of the spring 21 the upper piston will rise and the tension of the spiral spring 99 will force the lower piston with it even though the liquid pressure on each side thereof is equal. As the pressure continues to increase the pistons will both rise together, holding valve member I93 in the seat illd until the tension on spring 98 is the passage I95 to chamber 98 and through the outlet ti.

The openings of passages 69 and 26 are so arranged with respect to'the vacuum and pressure passages of the pump that the unit may be mount-- 'ed as shown in the drawings, or it may be mounted in any oneof three other positions, viz. the strainer may be at the left hand side of'the pump, which will provide the proper mounting in case the pump rotates in a direction contrary to that assumed with relation to the drawings; or in case of a rotation like that-last mentioned and where, I

it is desired to keep the strainer and regulating valve on the sides shown in the drawings, the

pump itself may be turned upside down so that the passages I9 and 2i will communicate with passages I29 and I2I respectively, and the plugs I 22 may then be changed from the position shown in Fig. l to the opposite or bottom side of the pump.

' Figs. to '13 illustrate a two-in-one unit of the type described and adapted for mounting on a front flange pump. This unit has a flange lot for engaging and being fastened to the flange I91 of the pump. The unit has arms I98 and I99 respectively. which-contain. passageways H9 and Ill respectively, for aligning with the pump suction-inlet and pressure outlet.

The unit has an inlet II2 leading into an annular strainer chamber I I3 and a strainer basket I I 4 filters the liquid as it is drawn therethrough by the suction of the pump. Theinterior of this basket communicates with a passage H5 in the unit cover I I6, and thence to the passageway II 9 leading to the vacuum side of the pump as before stated and as shown by the arrows. When the liquid is discharged irom the pump under pres-' sure into the a sa eway Ill it passes through passage III and then through vertical slots IIB to pressure chamber 22 of a valve similar to that shown in Fig. 4, but with they sleeve 5| and heavy square spring 46 omitted. The valve operates like the valve of Fig. 4, but its casing is open at the top topermit by passed liquid to be'drawn therefrom and into passage I I5, for return to the Pump.

While the unitherein illustrated has been de-.

casing and having an attaching face adapted to contact one of the faces of the pump, said strainer casing provided with aninlet port adapted to be connected with a. source oi liquid fuel supply and an outlet opening into the bridge face and forming communication with the suction side of said pump, a strainer unit in said strainer chamber interposed between the inlet port and outlet passage of saidchamber, said pump having an outlet port communicating through a passage lnsaid bridge face with the valve chamber, said valve chamber having a burner outlet port and a by pass port, pressure responsive means in said valve chamber subject to the pressure of the liquid fuel supplied from the pump outlet port for controlling said whereby the by-pass outlet port any excess'of liquid fuel over and above that discharged by the burner outlet port, means for variablyand selectively connecting said pump to said bridge wherebythe burner outlet port may be located on either, side of said pump regardless of the direction of rotation of said pump, and means for plugging the pump ports on the face not attached to the bridge.

2. In a liquid fuel supply unit for oil burners, the combination of a demountable pump having two opposed faces, an inlet port and an outlet port for each face, substantiallycylindrical casings containing respectively strainer means and valve means, a bridge integrally connecting said casings and having an attaching 'face adapted to'contact one of the faces of the pump, said strainer casing provided with an inlet port adapted to be connected with a source of liquid fuel supply and an outlet opening into the bridge face and forming communication with the suction side of the pump, said pump having an outlet port communicating through a passage in said bridge face with the valve chamber, said valve chamber having a burner outlet port and a by-pass port, means for variably and selectively connecting said pump to said bridge whereby the burner outlet port may be located on either side of said pump regardless of the direction of rotation of said pump, and means for plugging the pump ports on the face not attached to the bridge. 7

' 3. In a liquid fuel supply unit for oil burners, the combination of a demountable pump having two opposed faces, an inlet port and an outlet port for each face, substantially cylindrical casings containing respectively strainer means and valve means,. a bridge integrally connecting said casings and having an attaching face adapted to contact one of the faces of the pump, said strainer casing provided with an inlet port adapted to be connected with a source of liquid fuel supply and an outlet opening into the bridge face and forming communication with the suction side of the pump, said pump having an outlet port communicating through-a passage in said bridge face with the valve chamber, said valve chamber having a burner outlet port and a bypass port, a bolt extending through said bridge and into said pump for variably and selectively connecting. said pump to said bridge whereby the burner outlet port may be located on either side of said pump regardless of the direction of rotation of said pump, and means for plugging the pump ports on the face not attached to the bridge.

4. In a liquid fuel supply unit for oil burners, the combination of a demountable pump having two opposed faces, an inlet port and an outlet port for each face, substantially cylindrical casings containing respectively strainer means and valve means, a bridge integrally connecting said casings and having an attaching face adapted to contact one of the faces of the pump, said strainer casing provided with an inlet port adapted to be connected with a source of liquid fuel supply and an outlet opening. into the bridge face and forming communication with the suction side of the pump, said pump having an outlet port communicating through a passage in said bridge face with the valve chamber, said valve chamber having a burner outlet port and a bypass port, a bolt extending through said bridge and into said pump for variably and selectively connecting said pump to said bridge whereby the burner outlet port may be located on either on the face not attached to the bridge.

THOMAS MURPHYa 

